Gas-burner



W. T. CLARK;

GAS BURNER. APPLICATION FILED SEPT. 17, I92Q.

Patented Nov. 22, 1921 3 SHEETSSHEEI L W. T. CLARK.

GAS BURNER.

APPLICATION HLED SEPTI Patented Nov. 22, 1921,

3 SHEETS-SHEEI 2.

W. T. CLARK.

GAS BURNER.

APPLICATION HLED SEPT 17. 1920.

i tn neon.

WILBUR T. CLARK, OF CLEVELAND, OHIO, ASSIGNOR F ONE-HALF '10 PATRICK J.

, MORAN, OF EAST CLEVELAND, OHIO.

GAS-BURNER.

Specification of Letters Patent.

T -"atented Nov. 22, 11921..

Application filed. September 17, 1920. Seria1 No.41o,903.

To all whom it may concern:

Be it known that I, WILBUR T. CLARK,

a citizen of the United States, resident of Cleveland, county of Cuyahoga," and State of Ohio,-have invented new and useful Tmprovements in Gas-Burners, of which the following is a specification, the" principle of the invention being herein explained and the best mode in which I havecontemplated applying that principle, so as to'distinguish it from other inventions.

My invention relates to gas burners Particularly, the invention relates to a new and improved combination of means for mixing air and gas for use in connection with blast furnace operations, boiler operations, etc. The object of the invention is to provide a combination of such means in which economically there will be provided a wellmixed fuel furnishing hotcombustion.

The annexed drawings and the following description set forth in detail certain means embodying my invention, the disclosed means, however, constituting but one of the various mechanical forms in which the principle of the invention may be applied.

In said annexed drawings:

Figure 1 represents a central vertical longitudinal section of a gas burner embodying my. improved means, a suggestion of the ordinary blast furnace stove being also shown; V

Fig. 2 represents a fragmentary elevation of a stove door and its support, the door being shown in closed position;

Fig. 3 represents a partial side elevation and a partial central vertical longitudinal section of the elements illustrated in Fig. 1, showing the stove door in position and the burner moved outfrom the stove;

Fig. 4 represents a front elevation of a pair of units embodying my invention, as

3. an exemplification of my improved gas burner is shown in relation to a blast furnace stove 1, an annular casing which surrounds and lies adjacent to the stove door opening, and to which is fitted the usual cover, as

hereinafter explained, being indicated by the ordinal 2. As is well known in blast furnace practice, there is provided a gas conduitfi controlled by a valve 3 I sub-divide this conduit 3 before the same discharges into the combustion chamber 6 of the stove 1 and make two conduits thereof, a central main cylindrical conduit 8 and a surrounding annular conduit 4. This latter conduit 4, or by-pass from the conduit 3 to the chamber 6, is formed by .a nozzle 9 and is controlled inthe manner hereinafter described in detail, The central main conduit 8 is formed by a nozzle 8, including an elbow 8 mounted in a nozzle 12, and is controlled by a valve 8 The nozzle 12 forms an annular conduit 5 surrounding the conduit 8, controlled by a suitable valve 5 and furnishing air to the combustion chamber 6. This air conduit 5 is disposed intermediately of the gas conduit '8 and the gas by-pass 4. These conduits 4, 5 and 8 discharge into the combustion chamber 6 through a fitting 10 which, in the form of device shown, is an extension of the nozzle 9 forming the annular gas passage 4, and has a central restricted portion 10' forming, in effect, a venturi, and producing the usual increased velocity of a venturi. The result of this construotion will be hereinafter described in detail. Mounted exteriorly of'the venturi co-nnec' tion 10 is a ring 11 which is adjustable upon the fitting 10 inwardly and outwardly of the combustion chamber 6 to control an outer auxiliary air inlet '7 discharging into the combustion chamber 6 exteriorly of the venturi connection 10. Also, the nozzle 12 forming the air passage 5 is adjustable toward and from the venturi connection 10 to control the opening 16, through which the gas from the by-pass 4 passes into the venturi 10. This adjustment is secured by means of the collar 13 secured exteriorly of the nozzle 12 and adjustable longitudinally of the nozzle 9 by means of the elongated slots 14 formed in the nozzle 9, the collar 13 being secured to the nozzle 9 by means of the bolts 15, intersecting said slots v14, as plainly air. The enlargement 102 of the venturi slows up the velocity and induces a. swirling motion which creates a good mix between the gas and air. An outer lip 10 upon the casting 10 also aids in creating a swirling between the gas and air, this lip being of less diameter than middle portion of the casting 10 The construction also creates a negative pressure inducing additional air through the exterior auxiliary air inlet. 7 This outer venturi effect is caused by the restricted opening formed between the enlargement 10 of the venturi 10 and the stove casing. This outer venturi also results in a still better mixture between the gas and air.

Vfhenever it is desired to discontinue the furnishing of gas and air to the stove 1, the nozzles 9 and 12, including the movable part of the fitting 10, and the pipe 8' are moved back away from the door of the stove 1 in the manner hereinafter described, and the cover 17 is swung into place. This cover 17 is carried by the hanger 18, in turn carried by suitable trolley wheels, and also supporting the spider 19, of the design plainly shown in Fig. 2, which is adapted to inclose the bolts 20 and to receive the hinge bolt 21. The means for moving the nozzles 9 and 12 relatively to the stove 1 are provided by the hand wheel 22 rotatably secured to a shaft 23, to which shaft is secured a pinion 24 adapted to engage with a rack 25 suitably supported. The base upon which the rack 25 is mounted is adapted to cover the opening 3' of the gas passage 3 when the nozzles are moved back from the stove, as plainly shown in Fig. 3. This construction for moving the nozzles inwardly and outwardly of the stove is well known to those versed in the art. The line of separation between the two venturi castings 10 and 10 is so'designed that they form a smooth surface when the burner is in its inner working position.

Referring to Figs. 4 and 5, there is therein suggested by the ordinal 27 a boiler having a combustion chamber 26. These figures illustrate the application of .my new and improved as burner to the operation of such holler. n this application, the gas passage 3 is not sub-divided, so that the gas is furnished to the chamber 26 by means of only one conduit 4, the latter being controlled by the valve 29. In this application, the gas burner is permanently fixed and the venturi 10 is an integral extension of the gas nozzle 9'. Air is furnished interiorly of the gas conduit 4' through the conduit 5, and the latter is controlled by a damper 28 having apertures 28 adapted to register varying amounts with the openings of the pipe 5, or

to close said openings completely. Exteriorly of the forward venturi extension 10 of the gas nozzle 9' is formed an auxiliary air inlet 7 controlled by the adjustable collar 11, all as plainly shown in Fig. 5. I have shown two units of my improved gas burner supplied to the boiler 27, and it will be noted that a plurality of air pipes 55 are provided for each unit, there being six of these pipes, in the form of device shown, contained within each gas nozzle 9'.

Inasmuch as the device disclosed herein'is of quite general application, it is to be understood that the term furnace as used in the claims is intended to refer generically to any structure or mechanism having a combustion chamber adapted to be heated by burning gas therein. I

What I claim is:

1. In a. gas burnenthe combination with a furnace having a combustion chamber; of a nozzle comprising concentric tubular conduits forming air and gas passages, the outer conduit extending beyond the inner and having a restricted discharge end; and a tubular casting fixed to the furnace, having an outer restricted end adapted to make a smooth joint with the restricted discharge end of said nozzle and having an inner 'restricted discharge end, said nozzle being movable toward and fromthe furnace.

2. Tn a gas burner, the combination with a furnace having a combustion chamber; of an annular gas nozzle; means forming an air inlet interiorly of said nozzle; a tubular casting fixed to said nozzle and forming a continuation thereof; a tubular casting fixed to the furnace and adapted to make a smooth joint with the first mentioned casting, said castings forming a venturi extension for the .nozzle; and means forming an auxiliary air inlet to said chamber surrounding said venturi extension, the nozzle being movable toward and from the furnace.

3. In a gas burner, a gas nozzle comprising an outer tubular casing and inner tubular conduits forming a central tubular passage and surrounding annular passages, said outer casing projecting beyond said inner tubular condults and having a restricted disair to alternate passages.

4. In a gas burner, a gas nozzle comprising an outer tubular casing and inner tubular conduits forming a central tubular passage and surrounding annular passages, said outer casing-having a double venturi extension beyon' the discharge ends of said inner conduits, said extension having a restricted portion, an intermediate enlarged portion and a restricted discharge orifice; and means for admltting air and gas to alternate passages.

5. In a gas burner, the combination with a furnace having a, combustion chamber; of

.1 15 charge end; and means for admitting gas and a gas nozzle comprising discharge extension having alternate enlarged and restricted portions and forming a mixing chamber; and air and gas inlet passages opening into said extension; and a converging air inlet passage into said combustion chamber surrounding said extension.

6. In a gas burner, the combination with a furnace having a combustion chamber; of an annular gas nozzle; means forming an air inlet interiorly of said nozzle; a casting fixed to said nozzle and projecting forwardly thereof; a casting secured to the furnace and adapted to make a smooth joint with the first mentioned casting, said castings forining a venturi extension for said nozzle;

said gas passage and said by-pass; a casting secured in said gas passages and said air-furnishing means and surrounding and extending forwardly of the same; a casting secured to the furnace and adapted to make a smooth joint with the first mentioned casting, said castings forming a venturi connection intermediate the stove and the nozzle and inlet; and means forming an air inlet to said chamber surrounding said venturi connection, the nozzle and inlet being movable toward and from the furnace.

8. In a gas burner, the combination with a furnace having a combustion chamber; of means forming a gas passage leading to said chamber; a by-pass from said passage to said chamber; means for controlling said by-pass; and means furnishing air to said chamber intermediately the gas streams issuing from said gas passage and said by-pass.

9. In a gas burner, the combination with a furnace having a combustion chamber; of means forming a gas passage leading to said chamber; a by-pass from said passage to said chamber; means for controlling said by-pass; means furnishing air to said chamber intermediately the gas streams issuing from said gas passage and said by-pass; and means furnishing auxiliary a1r to sald chamber exteriorly of the aforesaid gas passage and bypass.

10. In a gas burner, the combination with a furnace having a combustion chamber; of means forming a gas passage leading to said chamber; a by-pass from said passage to said chamber; means for controlling said icy-pass; means for controlling said gas passage intermediate said by-pass and said chamber; and means furnishing air to saidchamber intermediately the gas streams issuing from said gas passage and said by-pass.

11. In a gas burner, the combination with a furnace having a combustion chamber; of means forming a gas passage leading to said chamber; a by-pass from said passage to said chamber and surrounding said passage; means for controlling said by-pass; means furnishing air to said chamber intermediately the gas streams issuing from said gas passage and said by-pass; and means furnishing auxiliary air to said chamber exteriorly of said by-pass.

12. In a gas burner, the combination with a furnace, having a combustion chamber; of means forming a gas passage leading to said chamber; a by-pass from said passage to said chamber and surrounding said passage; means for controlling said by-pass; means furnishing air to said chamber intermediately the gas streams issuing from said-gas passage and said by-pass; means furnishing auxiliary air to said chamber exteriorly of said by-pass; and means forming a venturi through which the auxiliary air passes.

13. In a gas burner, the combination With a furnace having a combustion chamber; of means forming a gas passage leading to said chamber; a by-pass from said passage to said chamber and surrounding said passage; means for controlling said by-pas's; means furnishing air to said chamber intermediately the gas streams issuing from said gas passage and said by-pass; means for controlling said air-furnishing means; means furnishing auxiliary air to said chamber exteriorly of said by-pass; and means for controlling said auxiliary air.

-14. In a gas burner, the combination with a furnace having a combustion chamber; of means forming a gas passage leading to said chamber; a by-pass from said passage to said chamber and surrounding said passage; means for controlling said by-pass; means furnishing air to said chamber intermediately the gas streams issuing from said gas passage and said by-pass, said by-pass being formed into a venturi projecting forwardly of said air-furnishing means,through which venturi the gas from the gas passages, and said air, pass; and means furnishing auxiliary air to said chamber exteriorly of said venturi.

15. In a gas burner, the combination with a furnace having a combustion chamber; of a controllable gas passage leadingto said chamber, said passage being subdivided into a' central cylindrical conduit and a surrounding annular conduit; means for controlling said annular conduit; means forming a controllable annular air conduit disposed intermediate said central gas conduit and said annular gas conduit; and means forming a controllable auxiliary air inlet to said chamber exteriorly of. said annular gas conduit. 16. In a gas burner, the combination with a furnace having a combustion chamber; of a controllable gas passage leading to said chamber, said passage being subdivided into a central cylindrical conduit and a surrounding annular auxiliary conduit;-means for controlling said auxiliary conduit; means forming a controllable annular air conduit disposed intermediate said central gas conduit and said annular gas conduit, the latter being formed into a venturi projecting forwardly of said air conduit, into which venturi the air conduit and the gas conduits discharge; and means forming a naeaaoi controllable auxiliary air inlet to said chamber exteriorly of said venturi.

'1'? .r in a gas burner, the combination with a furnace having a combustion chamber; of a controllable gas passage leading to said chamber, said passage being subdivided into a central cylindrical conduit and a surrounding annular conduit; means for controlling said annular conduit; means for controlling said central conduit; means forming a controllable annular air-conduit disposed intermediate saidcentral gas conduit and said annular gas conduit; and means iorming a controllable auxiliary air inlet to, said chamber exteriorly of said annular conduit. I

Signed by me, this 7th day of September, 19 ().v

WILBUR T. CLARK. 

